Compilare: main.cpp: In function 'std::vector<int> grayPermutation(int)': main.cpp:75:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 75 | for (int i = 0; i < grayCodes.size(); i++) { | ~~^~~~~~~~~~~~~~~~~~ main.cpp:83:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 83 | for (int j = 0; j < grayCodes[0].size(); j++){ | ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:86:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 86 | for (int i = 1; i < grayCodes.size(); i++) { | ~~^~~~~~~~~~~~~~~~~~ main.cpp:99:27: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 99 | if (result.size() == M) | ~~~~~~~~~~~~~~^~~~